Poincaré inequalities on Carnot Groups and spectral gap of Schrödinger operators

Abstract In this work we give a sufficient condition under which the global Poincaré inequality on Carnot groups holds true for a large family of probability measures absolutely continuous with respect to the Lebesgue measure. The density of such probability measure is given in terms of homogeneous quasi-norm on the group. We provide examples to which our condition applies including the most known families of Carnot groups. This, in particular, allows to extend the results in our previous work [16]. A consequence of our result is that the associated Schrödinger operators have a spectral gap.